Exploring Electrochemistry: A Hydrogen Peroxide Sensor Based on a Screen-Printed Carbon Electrode Modified with Prussian Blue.
Exploring Electrochemistry: A Hydrogen Peroxide Sensor Based on a Screen-Printed Carbon Electrode Modified with Prussian Blue.
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DOI：
10.1021/acs.jchemed.3c00844
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发表时间：
2023-11
影响因子：
3
通讯作者：
Jovica Todorov;G. McCarty;Leslie A. Sombers
中科院分区：
文献类型：
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作者：
Jovica Todorov;G. McCarty;Leslie A. Sombers
鉴于电化学技术在解决从关键能源短缺到实时医疗诊断的广泛全球问题方面的广泛适用性，越来越需要在本科课程中教授基本的电化学概念。然而，许多电化学概念通常在不同的实验室实验中教授，通过课程分散，这可能会对学生（和教师）造成威胁。这个实验，这已经过测试和优化，在本科课堂上多个学期，涵盖了广泛的电化学主题，实现了一个过氧化氢（H2O2）传感器，是基于普鲁士蓝电化学的建设。本实验介绍了循环伏安法的基本原理，促使学生区分伏安图的法拉第和电容分量，并根据电化学理论研究它们与扫描速率的关系。学生还通过在传感器表面电沉积普鲁士蓝薄膜来评估电催化作用，以及这种修饰对电子转移和传感器性能的影响。最后，学生将联合收割机电流测量与标准加入法相结合，以确定未知样品中的H2O2浓度。总的来说，这个实验提供了一个综合的和有凝聚力的经验，连接到一个3小时，动手实验室实验，需要最少的资源，往往是单独教许多重要的电分析概念。
There is an increasing need for fundamental electrochemistry concepts to be taught in the undergraduate curriculum, given the broad applicability of electrochemical technologies in addressing a wide range of global issues from critical energy shortages to real-time medical diagnostics. However, many electrochemical concepts are often taught in disparate laboratory experiments, spread out through the curriculum, which can be intimidating to students (and instructors). This experiment, which has been tested and optimized in the undergraduate classroom over multiple semesters, covers a wide range of electrochemistry topics in realizing the construction of a hydrogen peroxide (H2O2) sensor that is based on Prussian blue electrochemistry. The experiment introduces the fundamentals of cyclic voltammetry by prompting students to distinguish faradaic and capacitive components of voltammograms and to investigate their relationship with scan rate as per electrochemical theory. Students also evaluate electrocatalysis through electrodeposition of a thin film of Prussian blue on the sensor surface and the effects of this modification on electron transfer and sensor performance. Finally, students combine amperometric measurements with the method of standard additions to determine H2O2 concentrations in an unknown sample. Overall, this experiment offers an integrated and cohesive experience that connects many important electroanalytical concepts that are often taught individually into one 3 h, hands-on laboratory experiment that requires minimal resources.